1pfsinppm(1) General Commands Manual pfsinppm(1)
2
6 pfsinppm - Load images or frames in PBM formats
7
9 pfsinppm (<file> [--linear] [--absolute <max_lum>] [--frames <range>]
10 [--skip-missing]) [<file>...]
11
14 pfsinppm command loads images in PBM formats (PPM, PNM or PGM) and
15 writes pfs stream to the standard output. The pfs stream is usually
16 piped to another program for further processing. To detect the format
17 automatically based on the extension, use pfsin command. For more
18 information on PBM formats, refer to the NetPBM web page
19 (http://netpbm.sourceforge.net/).
20 Note that PPM or PNM images are low dynamic range. Therefore pixel val‐
22 ues (0-255) are scaled to 0-1 before storing them in pfs stream. Simi‐
23 larly, before writing low dynamic range image from pfs stream, pixel
24 values are multiplied by 255. By default, the 'LUMINANCE' tag is set
25 to 'DISPLAY'. The '--linear' switch can force the inverse sRGB trans‐
26 formation and provide linear data. In this case the 'LUMINANCE' tag is
27 set to 'RELATIVE'. '--absolute' switch can be used to convert pixels to
28 absolute luminance values.
29 To read images from standard input use a single dash '-' instead of
31 filename. The images are read until EOF is reached.
32 Each file can contain a %d pattern, which is substituted with frame
34 numbers. The pattern has the same syntax as C printf command. For exam‐
35 ple, you can use %04d to make the frame number four digit with proceed‐
36 ings zeros. See the OPTIONS section below for details.
37
39 --frames <range>
40 Range is given in mathlab / octave format:
41 startframe:step:endframe
43 Frame numbers start with startframe (default 0), are increased
45 by step (default 1) and stop at endframe You can skip one of
46 those values, for example 1:100 for frames 1,2,...,100 and 0:2:
47 for frame 0,2,4,... up to the last file that exists.
48 --skip-missing
51 Skip up to ten frames in a row if corresponding files are miss‐
52 ing. Otherwise the program stops reading sequence at the first
53 file that does not exists. This switch does not apply to the
54 first frame in a sequence. This switch can be useful if there is
55 a rendered animation where some of the frame has not been gener‐
56 ated.
57 --linear, -l
60 Converts pixel values to linear luminance (XYZ), assuming the
61 sRGB color space for the input image. The maximum pixel value
62 (255,255,255) is mapped to Y=1. LUMINANCE tag is set to RELA‐
63 TIVE.
64 --absolute <max_lum>, -a <max_lum>
67 --absolute converts pixel values to an absolute linear luminance
68 (XYZ), that is the color space, in which channel Y contains
69 luminance given in cd/m^2. The sRGB color space is assumed for
70 the input image. The maximum pixel value (255,255,255) is mapped
71 to Y=<max_lum>. <max_lum> is typically set to 80 [cd/m^2] for a
72 CRT monitor. LUMINANCE tag is set to ABSOLUTE. --absolute
73 process images almost the same as --relative, but additionally
74 it scales all pixels by <max_lum>.
75
78 pfsinppm frame%04d.ppm --frames 0:10 | pfsview
79 Read frames from files frame0000.ppm, frame0001.ppm, ...,
81 frame0010.ppm and show them using pfsview.
82
85 Please report bugs and comments on implementation to the discussion
86 group http://groups.google.com/group/pfstools
87
89 pfsin(1), pfsout(1)
90 pfsinppm(1)